Don't listen to those saying you can carry snail BEFORE taming. It's a troll. I have been told this trick for months, yet I have only attempted one time. You can NOT carry anything you haven't tamed.

I can't vouch for carrying after knock, I haven't tried it yet. Just don't let others trick you. Prepping for taming this thing is as much of a headache as the actual work. Just make sure you have the area cleared, or bring some foundations and walls to box it in while taming. That is what I do.